Combustion Possibility of Dry Sewage Sludge as a Blended Fuel of Anthracite Fired Power Plant

スポンサーリンク

概要

• 論文の詳細を見る

• The aim of this study is to predict combustion possibility of dry sewage sludge as a blended fuel in commercial anthracite fired plants. Combustion characteristics of various blends of sludge on basis of design anthracite coal were studied by thermogravimetric analysis (TGA) and drop tube furnace (DTF). TGA results showed that the volatile contained with major content in dry sludge was rapidly burned than it of anthracite. The sludge is mainly formed by two organic fractions with different reactivity; the more reactive fraction decomposes and burns at lower temperature than those of anthracite, in case of the sludge blends with less than 15%, closer to those of anthracite. For the sludge blends of more than 20%, interactions of the components between anthracite and sludge were detected. The Arrhenius kinetic parameters were calculated from the experimental results, considering the process as a series of consecutive first order reactions. Coal activation energy is scarcely improved as a consequence of a low addition of sludge (15 wt% blends). Activation energies for overall combustion of anthracite and sludge are 75.380 and 17.410 kJ/mol, respectively. It was derived that activation energies for the combustion of the sludge blends with 30% and 50% are 20.951 and 15.140 kJ/mol in reciprocal proportion to the volatile matter content and blending ratio of sludge. DTF test results show that the volatile content in sludge significantly improved the combustion efficiency of the sludge blends whereas the unburned carbon in combustion by-product reduced. The conversion behaviors of the anthracite, sludge, and the sludge blends observed in DTF were similar to that reflected in TGA. DTF char studies showed that the sludge blends was higher conversion than the anthracite coal due to the porous char formation, the combustion of most sludge blends was completed at residence time of around 1 second, set temperature range of 1,100°C similar to commercial coal fired plant. In case of the sludge blends of less than 30%, these high initial deformation temperature (IDT) of sludge ashes with minimum 1,210°C are not expected to be associated with slagging and fouling in pulverized coal fired systems.

著者

• KIM Jae-Kwan

  Power Generation Laboratory, Korea Electric Power Corporations Research Institute

• LEE Hyun-Dong

  Power Generation Laboratory, Korea Electric Power Corporations Research Institute

関連論文

• Combustion Possibility of Indonesia KBB Coal with High Moisture as a Pulverized Fuel of Thermal Power Plant
• Combustion Possibility of Dry Sewage Sludge as a Blended Fuel of Anthracite Fired Power Plant
• Design Variables of Pilot Scale Electrostatic Separator for Removing Unburned Carbon from Coal Fly Ash
• Two-Step Heating Process for the Synthesis of Zeolite Na-Y from Coal Fly Ash

スポンサーリンク